JP2019095576A - Image formation device - Google Patents

Abstract

To provide an image forming apparatus capable of improving productivity when a defect is judged and defective products are removed and replaced with non-defective products. An image forming apparatus includes an image forming unit that forms an image on a printing paper, an image reading unit that reads a printed material including an image formed on the printing paper by the image forming unit, and an image forming unit. Formed by the image forming unit 23 on the basis of the determination threshold value for specifying the allowable error in the printing state of the printed material including the image formed on the printing paper and the read data corresponding to the printed material read by the image reading unit 91. And a control unit 101 that determines the quality of a printed material including an image formed on the printed paper. The control unit 101 reprints the page on which the printed material including the image formed on the printing paper by the image forming unit 23 is determined to be defective, and executes replacement. [Selection] Figure 1

Description

  The present disclosure relates to an image forming apparatus.

  There is an inspection technique of reading an image formed on a recording material such as a sheet by an image forming apparatus and determining the quality of the image. For example, it has been proposed to determine the quality of the image based on the determination threshold and then change the determination threshold to determine the quality of the image again to specify the defect area and display the image indicating the specified defect area. (See, for example, Patent Document 1).

JP, 2015-117957, A

  However, in the prior art as described in Patent Document 1, although it is possible to judge the quality of a printed matter on which an image is formed on a sheet and to display the number of detected defects etc. for each page, it is judged as defective. Since it takes time and effort to remove the waste paper and replace it with a non-defective product, there is a possibility that the productivity may be significantly reduced.

  The present disclosure has been made in view of such a situation, and is intended to improve productivity when a defective product is removed and a defective product is removed and replaced with a non-defective product.

  An image forming apparatus according to one aspect of the present disclosure includes an image forming unit that forms an image on printing paper, an image reading unit that reads a printed matter including an image formed on the printing paper by the image forming unit, and the image forming unit Printing by the image forming unit based on the determination threshold value specifying the tolerance of the printing state of the printed matter including the image formed on the printing paper by the image forming unit and the read data corresponding to the printed matter read by the image reading unit A control unit that determines the quality of a printed matter including an image formed on paper, and the control unit determines that the printed matter including the image formed on the printing paper by the image forming unit is a defective product Reprint and execute replacement.

  Further, it is preferable that, when the read data corresponding to the printed matter is present when the threshold value for determination is updated, the control unit performs the quality determination of the printed matter by the read data corresponding to the printed matter.

  Preferably, the control unit causes the image forming unit to form an image on the printing paper when there is no read data corresponding to the printed material when the determination threshold is updated.

  The control unit further includes a discharge unit that discharges the printed matter, the discharge unit including a first tray and a second tray provided at a location different from the first tray. Among the printed matter, those which are determined to be non-defective are discharged to either one of the first tray and the second tray, and those which are determined to be defective are referred to as the first tray and the second It is preferable that the other of the trays be discharged.

  In addition, it is preferable that the printing apparatus further includes a bypass path that causes the printed matter to bypass the image forming unit.

  In addition, when the control unit is to replace a product determined to be a defective product with a product determined to be a non-defective product in the printed matter, the image forming unit performs the printing with the next sheet feeding of the printed material stopped. It is preferable to form an image on paper.

  Further, it is preferable that the control unit causes the image forming unit to form an image on the printing paper in a state in which the feeding of the next printed material is not stopped when the images on the printed materials are the same. .

  According to one aspect of the present disclosure, it is possible to improve productivity when a defective product is removed and a defective product is removed and replaced with a non-defective product.

FIG. 1 is a diagram showing an example of the overall configuration of an image forming apparatus 1 according to a first embodiment of the present disclosure. It is a flowchart explaining the example of control concerning Embodiment 1 of this indication. It is a flowchart explaining the example of control concerning Embodiment 2 of this indication.

  Hereinafter, embodiments of the present disclosure will be described based on the drawings, but the present disclosure is not limited to the following embodiments.

Embodiment 1
FIG. 1 is a diagram showing an example of the overall configuration of an image forming apparatus 1 according to a first embodiment of the present disclosure. As shown in FIG. 1, the image forming apparatus 1 includes an image forming apparatus main body 7, the post-processing apparatus 8 is connected to the sheet discharge side of the image forming apparatus main body 7, and the sheet discharge side of the post-processing apparatus 8. The post-processing device 9 is connected, and the post-processing device 10 is connected to the sheet discharge side of the post-processing device 9. A page inserter 81 is provided at the top of the post-processing device 8. The page inserter 81 transports the printed matter to be re-judged to the post-processing device 9 which is the rear stage side of the image forming apparatus 1 one page at a time. The printed matter includes the image formed on the printing paper by the image forming unit 23. In the page inserter 81, the conveyance to the post-processing device 9 is controlled by the third conveyance roller 211C. The third conveyance roller 211 </ b> C is provided on the conveyance path 21 of the printed matter in the post-processing device 8 and on the discharge side of the printed matter in the post-processing device 8. In the post-processing apparatus 9, an image reading unit 91 is provided on the conveyance path 21 of the printed matter. The image reading unit 91 is formed of, for example, an in-line sensor, and generates read data corresponding to the printed matter by reading the printed matter in the main scanning direction according to the conveyance of the printed matter. The post-processing apparatus 9 is provided with a fourth conveyance roller 211D on the conveyance path 21 of the printed matter and on the downstream side of the image reading unit 91 in the traveling direction of the printed matter. A first tray 201A is provided from the fourth transport roller 211D to the outside of the casing constituting the post-processing device 9. Therefore, the printed matter is discharged to the first tray 201A by the fourth conveyance roller 211D. The post-processing apparatus 10 is provided with a fifth conveyance roller 211E on the conveyance path 21 of the printed matter, on the downstream side in the traveling direction of the printed matter and on the discharge side of the printed matter in the post-processing apparatus 10. A second tray 201B is provided from the fifth transport roller 211E to the outside of the casing constituting the post-processing apparatus 10. Therefore, the printed matter is discharged to the second tray 201B by the fifth conveyance roller 211E. When the first tray 201A and the second tray 201B are collectively referred to, they are referred to as the discharge unit 201. In addition, the second tray 201B is provided at a location different from the first tray 201A.

  The image forming apparatus 1 includes an image forming unit 23 that forms an image on printing paper placed on the sheet feeding unit 20 in the image forming apparatus main body 7, and a setting unit 6 is provided on the image forming apparatus main body 7. ing. The setting unit 6 includes a display unit 61 and an operation unit 62. The setting unit 6 receives an operation of the operator via the operation unit 62 and displays information by the display unit 61. For example, the change of the determination threshold value , Selection of the redetermination mode, and selection of read data to be used for the redetermination. The determination threshold value specifies the tolerance of the printing state of the printed matter including the image formed on the printing paper by the image forming unit 23. As the determination threshold value, for example, the tolerance of the size, density, or inclination of the image formed on the printed matter is specified. The re-determination mode is a mode in which the determination of the loss is performed again after the determination of the loss. The read data used for the redetermination is stored in the storage unit 111 provided in the image forming apparatus main body 7. The read data used for the redetermination is read by the image reading unit 91. The storage unit 111 is realized by, for example, a nonvolatile semiconductor memory such as a flash memory or a hard disk drive, and stores various data. The storage unit 111 stores, in addition to the read data, for example, image data when forming an image on a printed matter. The image data is obtained by screen processing a print job received by the image forming apparatus 1.

  The image forming apparatus main body 7 is provided with an automatic document feeding device and a document image scanning device for automatically reading a document. The document image scanning device can read an image through a platen glass. The document image scanning device reads, for example, an image of a document, is stored in the storage unit 111, and is used for forming an image by the image forming unit 23. The image forming unit 23 is provided on the conveyance path 21 and on the downstream side in the conveyance direction of the printing paper by the first conveyance roller 211A. The first conveyance roller 211 </ b> A feeds the printing sheet placed on the sheet feeding unit 20 and conveys the sheet toward the image forming unit 23. The image forming unit 23 includes photosensitive members 44 respectively prepared for respective colors such as cyan, magenta, yellow, and black, and around the respective photosensitive members 44, a charging device 41, an exposure device 42, and a developing device 43 are provided.

  The surface of the photosensitive member 44 charged by the charging device 41 is exposed to an image by the exposure device 42 based on the image information of the document stored in the storage unit 111, and an electrostatic latent image is formed. The electrostatic latent image is developed by the developing device 43 into a toner image. The toner image is transferred to the intermediate transfer belt 46. The toner image transferred to the intermediate transfer belt 46 is transferred onto the printing paper transported along the transport path 21 by the second transport roller 211 B while being pressure-bonded by the secondary transfer roller 47. The second conveyance roller 211 </ b> B not only conveys the printing paper along the conveyance path 21, but also conveys the printed matter along the bypass path 27. That is, the second conveyance roller 211B conveys the printing paper or the printed matter along any one of the conveyance path 21 and the bypass path 27. The bypass path 27 bypasses the image forming unit 23 to the printed matter. The toner image pressed and transferred by the secondary transfer roller 47 is heated and pressed by the fixing unit 25 to be fixed on the printing paper, and as a result, the printed matter is printed by the image forming apparatus main body 7. That is, the image forming unit 23 transfers an image to printing paper by performing image formation by an electrophotographic process. A drum cleaning device 45 is provided around the photosensitive member 44. The drum cleaning device 45 removes residual toner remaining on the intermediate transfer belt 46. The conveyance path 21 is a path for feeding a printing sheet from the sheet feeding unit 20 and conveying the sheet. The first conveyance roller 211A, the second conveyance roller 211B, the third conveyance roller 211C, the fourth conveyance roller 211D, and the fifth conveyance roller 211E are collectively referred to as a conveyance unit 211.

  The control unit 101 includes a CPU, a ROM, a RAM, an I / O interface, and the like (not shown). The CPU reads out a program from the ROM according to the processing content, expands it in the RAM, and controls the operation of the image forming apparatus 1 in cooperation with the expanded program. Various data stored in the storage unit 111 are referred to when the CPU controls the operation of the image forming apparatus 1. Specifically, based on the determination threshold value and the read data corresponding to the printed matter read by the image reading unit 91, the control unit 101 uses the printed matter including the image formed on the printing paper by the image forming unit 23. Make a pass / fail judgment. More specifically, the control unit 101 reprints a page determined to be a defective product that includes a printed matter including an image formed on a printing paper by the image forming unit 23 and executes replacement.

  When read data corresponding to the printed matter exists when the determination threshold is updated, the control unit 101 performs non-defective product judgment of the printed matter using the read data corresponding to the printed matter. The control unit 101 causes the image forming unit 23 to form an image on a printing paper when there is no read data corresponding to the printed matter when the determination threshold is updated, and the image reading unit 91 reads the image formed on the printing paper. Make it read by and generate read data. The control unit 101 causes one of the first tray 201A and the second tray 201B to discharge one of the printed products determined to be non-defective, and the one determined to be non-defective as the first tray 201A and the first tray 201A. The other of the two trays 201B is discharged. The control unit 101 forms an image on the printing paper by the image forming unit 23 in a state where the next feeding of the printed material is stopped when replacing the printed material determined as the defective product with the one determined as the non-defective product. The new printed matter is judged again as good or bad, and if judged as non-defective, the new printed matter is discharged to one of the first tray 201A and the second tray 201B which is judged as non-good. Let

  FIG. 2 is a flowchart illustrating a control example according to the first embodiment of the present disclosure. In step S11, the control unit 101 determines whether there is a change in the setting of the determination threshold. When it is determined that the setting of the determination threshold is changed (step S11; Y), the control unit 101 proceeds to the process of step S12. When it is determined that the setting of the determination threshold is not changed (step S11; N), the control unit 101 continues the process of step S11. In step S12, the control unit 101 changes the setting of the determination threshold. In step S13, the control unit 101 determines whether the re-determination mode is selected. When it is determined that the re-determination mode is selected (step S13; Y), the control unit 101 proceeds to the process of step S14. When it is determined that the re-determination mode is not selected (step S13; N), the control unit 101 continues the process of step S13. In step S14, the control unit 101 determines whether there is read data that has been read before. When it is determined that there is read data that has been read before (step S14; Y), the control unit 101 proceeds to the process of step S15. When it is determined that there is no read data that has been read before (step S14; N), the control unit 101 proceeds to the process of step S25. In step S <b> 15, the control unit 101 determines whether a printed matter to be re-judged has been installed. When the control unit 101 determines that the printed matter to be re-judged is installed (step S15; Y), the control unit 101 proceeds to the process of step S16. When it is determined that the printed matter for which the determination is to be made is not set (step S15; N), the control unit 101 continues the process of step S15. In the determination process of step S15, for example, a sensor (not shown) may be provided in each of the page inserter 81 and the sheet feeding unit 20, and it may be determined whether or not the printed matter is installed by those sensors.

  In step S16, the control unit 101 displays a list of read data. Specifically, read data is displayed on the display unit 61 in job units. This allows the user to select read data in job units via the operation unit 62. In step S17, the control unit 101 determines whether read data to be re-judged is selected. When it is determined that the read data to be re-judged is selected (step S17; Y), the control unit 101 proceeds to the process of step S18. If it is determined that the read data for which the determination is to be made is not selected (step S17; N), the control unit 101 continues the process of step S17. In step S18, the control unit 101 sets the selected read data as a determination target. In step S19, the control unit 101 reads read data corresponding to the set determination target. In step S20, the control unit 101 starts re-determination of the read data that has been read, based on the changed setting of the determination threshold.

  In step S21, the control unit 101 causes the printed matter to be determined to be fed corresponding to the read data to be determined again. In step S22, the control unit 101 determines whether or not the printed material to be judged which is fed is a non-defective product. When the control unit 101 determines that the printed material to be determined which is fed is a non-defective product (step S22; Y), the process proceeds to step S23. If the control unit 101 determines that the printed material to be determined which is fed is not a non-defective product (step S22; N), the process proceeds to step S30. In step S23, the control unit 101 discharges the printed matter to be determined on the non-defective product tray. For example, if the first tray 201A is a non-defective tray, it is discharged to the first tray 201A. In step S24, the control unit 101 determines whether there is a next printed material. If the control unit 101 determines that there is the next printed matter (step S24; Y), the process returns to the process of step S21. If the control unit 101 determines that there is no next printed matter (step S24; N), the process ends.

  In step S25, the control unit 101 determines whether there is a printed matter to be read. When it is determined that there is a printed matter to be read (step S25; Y), the control unit 101 proceeds to the process of step S28. When it is determined that there is no printed matter to be read (step S25; N), the control unit 101 proceeds to the process of step S26. In step S26, the sheet feeding unit 20 feeds a print sheet. In step S27, the image forming unit 23 prints an image on printing paper. In step S28, the image reading unit 91 reads a printed matter and generates read data. In step S29, the control unit 101 sets all the generated read data as a determination target, and the process proceeds to step S19.

  In step S30, the control unit 101 causes the printed matter to be determined to be discharged onto the defect tray. For example, if the second tray 201B is a defect tray, it is discharged to the second tray 201B. In step S31, the control unit 101 stops the feeding of the next page of the printed matter to be determined. In step S32, the control unit 101 feeds a print sheet. In step S33, the control unit 101 reads image data corresponding to the page determined to be defective. The image data is stored, for example, in the storage unit 111. In step S34, the control unit 101 causes reprinting based on the read image data, and returns to the process of step S21.

  From the above description, in the first embodiment, the page determined to be a defective product with the printed matter including the image formed on the printing paper by the image forming unit 23 is reprinted and replacement is performed. Therefore, even if there are a plurality of printed matter, pages corresponding to defective products among the printed matter can be replaced. Therefore, it is possible to improve productivity when the defective product is removed and the defective product is removed and replaced with a non-defective product.

  In the first embodiment, when read data corresponding to a printed matter exists when the determination threshold is updated, the quality determination of the printed matter is performed using the read data corresponding to the printed matter. Therefore, since the quality determination of the printed matter is performed without reading it again, the processing time of the quality determination can be shortened. Therefore, the productivity can be improved as a whole.

  In the first embodiment, when read data corresponding to the printed matter does not exist when the determination threshold is updated, the image forming unit 23 forms an image on the printing paper. Therefore, since the printed matter for reading the printed matter is printed only when necessary, it is not necessary to perform useless image formation. Therefore, it is possible to reduce the overall cost of determining the quality of the printed matter.

  Further, in the first embodiment, among the printed products, those determined as non-defective items are discharged to one of the first tray 201A and the second tray 201B, and those determined as non-defective items are the first tray. It is discharged to the other of the tray 201A and the second tray 201B. Therefore, the non-defective product and the defective product are separately discharged. Therefore, since the operation | work which sorts non-defective goods and inferior goods out of several printed matter can be eliminated, the man-hour required for non-defective goods determination can be reduced notably especially.

  In the first embodiment, a detour path 27 for detouring the image forming unit 23 on the printed matter is provided. Therefore, since there is a path through which the printed matter passes without passing through the image forming unit 23, it is possible to avoid a situation in which the image forming unit 23 causes shape deformation such as dirt or shrinkage of the printed matter.

  Further, in the first embodiment, when the printed matter which is determined to be a defective product is replaced with one determined to be a non-defective product, the image forming unit 23 forms the printing paper in a state in which the next feeding of the printed matter is stopped. An image is formed. Therefore, it is possible to avoid feeding the next printed matter corresponding to the defective product, and therefore, it is possible to insert a newly printed page corresponding to the defective product. Therefore, since the pages of the printed matter corresponding to the non-defective products are arranged in order, the number of operation steps can be significantly reduced.

Embodiment 2
In the second embodiment, the configuration and functions of the image forming apparatus 1 are the same as in the first embodiment, and thus the description thereof is omitted. In the second embodiment, processing when the same image is printed on each of the printed matter will be described. FIG. 3 is a flowchart illustrating a control example according to the second embodiment of the present disclosure. The processes of step S51 to step S70, step S74, and step S75 of FIG. 3 are the same as the processes of step S11 to step S30, step S33, and step S34 of FIG. 1, and thus the description thereof is omitted. In step S71, the control unit 101 determines whether the images in each of the determination target printed matter are the same. If the control unit 101 determines that the images in each of the determination target printed matter are the same (step S71; Y), the control unit 101 proceeds to the process of step S73, and feeds the printing paper in step S73. If the control unit 101 determines that the images in each of the determination target printed matter are not identical (step S71; N), the process proceeds to step S72, and in step S72, the next page of the determination target printed matter is fed. Is stopped, and the process proceeds to step S73.

  From the above description, if the images in each of the printed matter are the same, the same image is printed on all pages, so there is no need to replace each page, and it is sufficient to combine only the number. Therefore, in the second embodiment, the control unit 101 causes the image forming unit 23 to form an image on the printing paper in a state where the next feeding of the printed material is not stopped when the images on each of the printed materials are the same. Therefore, since the processing time as a whole can be shortened by the part without stop operation, productivity can be further improved.

  The image forming apparatus 1 according to the present disclosure has been described above based on Embodiments 1 and 2. However, the present disclosure is not limited to this, and changes may be made without departing from the spirit of the present disclosure. Good.

  For example, in the present embodiment, an example in which the determination threshold is set via the operation unit 62 has been described, but the present invention is not particularly limited thereto. For example, the determination threshold may be transmitted from the outside and set in the image forming apparatus 1. Moreover, although the setting part 6 demonstrated an example which has the display part 61 and the operation part 62, it does not specifically limit to this. For example, as in a liquid crystal touch panel display, the display unit 61 and the operation unit 62 may be integrally configured.

Reference Signs List 1 image forming apparatus 6 setting unit 61 display unit 62 operation unit 7 image forming apparatus main body 8 post-processing apparatus 81 page inserter 9 post-processing apparatus 91 image reading unit 10 post-processing apparatus 20 paper feeding unit Reference Signs List 21 transport path 23 image forming section 25 fixing section 27 bypass path 41 charging device 42 exposure device 43 developing device 44 photoreceptor 45 drum cleaning device 46 intermediate transfer belt 47 secondary transfer roller 101 control portion 111 storage unit 201 discharge unit, 201A first tray, 201B second tray 211 transport unit, 211A first transport roller, 211B second transport roller 211C third transport roller, 211D fourth transport roller 211E 5 transport rollers

Claims (7)

An image forming unit that forms an image on printing paper;
An image reading unit that reads a printed matter including an image formed on a printing paper by the image forming unit;
The image based on the determination threshold value specifying the tolerance of the printing state of the printed matter including the image formed on the printing paper by the image forming unit, and the read data corresponding to the printed matter read by the image reading unit A control unit that determines the quality of a printed material including an image formed on a printing paper by the forming unit;
Equipped with
The control unit
Causing a page determined to be a defective product that includes an image formed on a printing paper by the image forming unit to be reprinted and to execute replacement.
Image forming apparatus. The control unit
When read data corresponding to the printed matter is present when the threshold value for determination is updated, quality determination of the printed matter is performed using read data corresponding to the printed matter.
An image forming apparatus according to claim 1. The control unit
When there is no read data corresponding to the printed matter when the threshold value for determination is updated, the image forming unit forms an image on the printing paper,
The image forming apparatus according to claim 1. A discharge unit that discharges the printed matter,
And further
The discharge unit is
With the first tray,
A second tray provided at a location different from the first tray;
Equipped with
The control unit
Out of the printed matter, those determined as non-defective items are discharged to either one of the first tray and the second tray, and those determined as non-defective items as the first tray and the second tray Discharge to the other
The image forming apparatus according to any one of claims 1 to 3. A detour path for causing the printed matter to bypass the image forming unit;
Further comprising
The image forming apparatus according to any one of claims 1 to 4. The control unit
In the case where the printed matter which is determined to be a defective product is replaced with one determined to be a non-defective product, the image forming unit forms an image on the printing paper while stopping the next feeding of the printed matter.
The image forming apparatus according to any one of claims 1 to 5. The control unit
When the image on each of the printed matter is the same, the image forming unit forms an image on the printing paper without stopping the next feeding of the printed matter.
The image forming apparatus according to any one of claims 1 to 5.

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